Female muscle growth and super-heroine transformation fans will love this two panel sequence. I assume it’s an age-progression sequence, showing the slender, teenage Supergirl being aged a few years forward into her big-breasted, muscular adult form (a la Power Girl). Or perhaps she’s just been subjected to concentrated solar rays that have caused her body to fill up with power and super sex-appeal? Maybe it’s red kryptonite that’s responsible?